64017447691 has 2 divisors, whose sum is σ = 64017447692. Its totient is φ = 64017447690.

The previous prime is 64017447673. The next prime is 64017447701. The reversal of 64017447691 is 19674471046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64017447691 is a prime.

It is not a weakly prime, because it can be changed into another prime (64017447661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32008723845 + 32008723846.

It is an arithmetic number, because the mean of its divisors is an integer number (32008723846).

Almost surely, 2^64017447691 is an apocalyptic number.

64017447691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64017447691 is an equidigital number, since it uses as much as digits as its factorization.

64017447691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 64017447691 in words is "sixty-four billion, seventeen million, four hundred forty-seven thousand, six hundred ninety-one".